The Body Mass Index (BMI) chart gives weight range guidelines and body fat estimates for adult women and men based on height, according to the National Heart, Lung, and Blood Institute. BMI values are used to categorize a person as underweight, normal weight, overweight or obese, states WebMD
The BMI is not an accurate measurement for athletes and other muscular people because it does not distinguish between fat and muscle mass. It also does not measure muscle loss accurately in older adults, reports the National Heart, Lung, and Blood Institute.
As of 2015, WebMD has a BMI index chart available online so site visitors can discover their own BMI values. A BMI value under 18.5 defines a person as underweight, while a value of 18.5 to 24.9 defines a person as normal weight. In comparison, an overweight person has a BMI between 25 and 29.9, while an obese person has a BMI over 30, according to WebMD.
While the BMI gives a loose guideline of the amount of fat a person has, waist circumference gives a clearer idea of the amount of a person's body fat, according to the National Heart, Lung, and Blood Institute. For example, a woman with a waist larger than 35 inches is at increased risk for obesity related illnesses.